Portable breakwater

ABSTRACT

A portable breakwater system for use in a body of water includes first and second support members adapted to be positioned on the floor of the body of water and a curtain attached between the first and second support members. The first and second support members allow the curtain to freely rise in response to a wave in the body of water so as to attenuate the wave. Each support member includes a base plate and a frame assembly extending upwardly from the base plate. The base plates can be anchored to the water floor with one or more weights. The frame assemblies include pivoting or telescoping sections that permit the curtain to rise in response to a wave. Alternatively, the curtain can be attached to pre-existing underwater structure, such as the support members of a dock located in the body of water. In this case, the curtain is attached to the support members via attachment sleeves that are slidingly mounted on the support members.

This application claims priority to U.S. provisional application Ser.No. 60/214,214, filed Jun. 23, 2000.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to systems and devices for attenuating ordissipating wave energy. More particularly, the present inventionrelates to portable systems and devices deployable in a body of waterbetween generated waves and a shoreline to be protected from waveimpact.

2. Description of Related Art

Anyone living along a shoreline, whether at the ocean, along a river, orbeside a lake or pond, is familiar with erosion. While some processes oferosion are subtler than others, waves produce the most apparent andrapid shoreline erosion. Underwater currents or external weather eventsmay generate waves. In addition, human activities, such as boating,produce sporadic but particularly devastating erosive waves. The ongoing and apparently increasing interest in the use of watercraft,particularly in confined bodies of water, indicates that shorelineerosion problems will remain and may increase.

The owners of shoreline property have to date had little recourse toprevent the man-made waves and certainly no recourse in regard tonaturally generated waves. As a result, periodic and costly repair ofthe shoreline is generally seen as the only way to respond to the impactof erosion. Of course, it is possible to introduce breakwater systemsformed of boulders, rocks, timbers, concrete structures, and the likeinto the water. The breakwater is intended to do as its name suggests:break up the flow of the water, whether in the form of a wave or anundercurrent, as it approaches the shoreline. That is done on occasionand typically seen in oceanside locations. However, such structures arepermanently set in a fixed position and they tend to disrupt the naturalappearance of the shoreline. Moreover, they ordinarily fall under thepurview of governmental authorities that place breakwaters for theintended common good of the general public, a particular group, or aspart of a larger plan or project. Although private individuals may placefixed breakwaters in the vicinity of their shorelines, assuming theyhave the right to put such structures in the water, they can be quiteexpensive. In addition, they may not be able to block all incomingwaves, dependent on changes in the direction of the waves. Moreover,they have a tendency to disrupt the natural appearance and/or usage ofthe shoreline. It is also to be noted that these structures are quiterigid and therefore deflect or transfer the wave energy from onelocation to another. That deflected energy may simply cause damage atanother location.

Therefore, what is needed is a breakwater system or device that issuitable for dissipating or attenuating the energy associated with wavescoming into a shoreline. Further, what is needed is such a breakwatersystem or device that is relatively inexpensive and simple to install incomparison to the introduction of existing fixed breakwater structures.Yet further, what is needed is a breakwater system that absorbs waveenergy rather than simply deflecting it. Also, what is needed is abreakwater system that is relatively portable such that it may be movedto a plurality of sites as desired by the user. Moreover, what is neededis a breakwater system that minimizes the disruption to the appearanceand/or use of the natural shoreline.

SUMMARY OF THE INVENTION

In view of the foregoing, it is an object of the present invention toprovide a breakwater system and related method to dissipate or attenuatethe energy associated with waves coming into a shoreline. It is also anobject of the present invention to provide a breakwater system that isrelatively inexpensive and easy to install in comparison to theintroduction of existing fixed breakwater structures. It is a furtherobject of the present invention to provide a portable breakwater systemthat may be deployed to a plurality of sites as desired by the user. Yetfurther, it is an object of the present invention to provide abreakwater system that absorbs rather than deflects wave energy. Stillfurther, it is an object of the present invention to provide abreakwater system that minimizes the disruption to the appearance and/oruse of the natural shoreline.

These and other objects are achieved with the present invention, whichin one embodiment is a portable breakwater system that is installed inthe water in proximity to a shoreline region to be protected. The systemincludes a base plate that is designed to rest on the floor of the bodyof water where the wave action is to be dissipated. Although the systemof the present invention may be used in any sort of water, it isparticularly advantageous in lakes and ponds because these bodies ofwater tend to have less fluctuation of water levels and less extremestorm conditions than oceans. The base plate is part of a larger supportsubsystem that also includes sites to selectably locate thereonstabilizing units such as one or more anchors or weights. Thestabilizing units and the base plate act to maintain the entirestructure in position through expected water movement conditions. Thesupport structure may be moved to one or more positions of interest anda plurality of support structures may be placed adjacent to one another.

The support system also includes frame mounts for receiving a frame. Theframe in turn acts as the retainer mechanism for locating a dissipationscreen or curtain in a variable position at, below, and above the watersurface. The screen or curtain acts as a wave-dissipating device in thatit is fabricated and formed to absorb, rather than deflect or transfer,energy. The frame is preferably configured to retain an upper portion ofthe curtain flat on a smooth water body surface. When wave actionbegins, the frame preferably enables movement of the upper portion ofthe curtain to a substantially completely upright position such that thewave energy, embodied in wave height, is diminished. The waterassociated with that wave action is allowed to pass around the curtainbut with a substantial portion of its forward-projecting energy absorbedby the curtain rather than the shoreline.

The combination of the portable frame and the absorbing curtain create awave dissipation system that may be set up where desired without greatdifficulty and relatively little expense. It is contemplated that thesystem will address the problems of soil and sediment erosion related todirect, oblique, or longshore waves, wakes, and/or water current actionthat flows in shallow and/or fluctuating water levels. These and otheradvantages of the invention will become apparent upon review of thefollowing description and the drawings.

DESCRIPTION OF THE DRAWINGS

The subject matter that is regarded as the invention is particularlypointed out and distinctly claimed in the concluding part of thespecification. The invention, however, may be best understood byreference to the following description taken in conjunction with theaccompanying drawing figures in which:

FIG. 1 is a perspective representation of the portable breakwater systemof the present invention shown in context.

FIG. 2 is a front view of a portion of the portable breakwater system ofthe present invention.

FIG. 3 is a cross-sectional view of a portion of a weight of the presentinvention.

FIG. 4 is a side view of a portion of the portable breakwater system ofthe present invention.

FIG. 5 is a side view of an offset hinge used in a support member of thepresent invention.

FIG. 6 is a cross-sectional detailed view of the weighting mechanism forthe optional frame top return of the present invention.

FIG. 7 is a perspective representation of a second embodiment of aportable breakwater system.

FIG. 8 is a front view of a portion of the portable breakwater system ofFIG. 7.

FIG. 9 is a cross-sectional detailed view of a telescoping postarrangement for the portable breakwater system of FIG. 7.

FIG. 10 is a front view of a third embodiment of a portable breakwatersystem.

FIG. 11 is an enlarged, detailed view of a portion of the portablebreakwater system of FIG. 10, showing a curtain attachment sleeve.

FIG. 12 is an exploded view of the attachment sleeve of FIG. 11.

DETAILED DESCRIPTION OF THE INVENTION

A portable breakwater system 10 of the present invention is shown inFIG. 1. The system 10 includes an attenuation or wave-impact curtain 12and a curtain support assembly 14. The system 10 is positionable on afloor 16 of a body of water 18. It may be used to absorb the energy ofone or more inbound waves 20 from impacting a shoreline 22 in order tominimize erosion of the shoreline 22.

With reference to FIGS. 1 and 2, the support assembly 14 includes afirst support member 24 and a second support member 26 having thecurtain 12 supported between them. Each of the first support member 24and the second support member 26 includes a frame base plate 28 and aframe assembly 30 extending upwardly from the base plate 28. The framebase plates 28 preferably include one or more securing cleats 31 tostabilize the base plate 28 on the underlying floor 16, particularlywhen that surface is rough or uneven in some way. The base plates 28 maybe fabricated of any suitable material of sufficient density and capableof surviving underwater conditions. Further, the base plate 28 may beformed with perforations in a surface thereof in order to allowunderwater currents to pass therethrough with minimal interference.

Each of the base plates 28 further includes a central frame-receivingport and, optionally, one or more post-receiving ports positioned on anupper base surface 29. The central port may be threaded or otherwiseconfigured to removably receive a first frame section 32 of therespective frame assemblies 30. That first frame section 32 may befabricated of a nonmetallic material or a metallic material and may behollow or solid. It is designed to be detachably affixed to the baseplate 28. Alternatively, the first frame section 32 can be fixedlyattached to the base plate 28.

Each support member 24 and 26 further includes one or more weights 36stacked thereon for the purpose of maintaining the respective baseplates 28 in place and ensuring that the entire system 10 remains inplace where positioned on the floor 16 during the variety ofenvironmental conditions to be experienced. The weights 36 arepreferably of a donut shape so that they may be mounted over the firstframe section 32. A locking or hitch pin 34 is inserted through thefirst frame section 32 just above the uppermost weight 36 to preventrelative movement between the first frame section 32 and the stack ofweights 36. Of course, the weights 36 may be formed in alternativeshapes provided they serve the function of anchoring the system and itscomponents in place where desired.

A first set of weights 36 substantially centered on the first framesection 32 defines the location of that portion of the first supportmember 24. A second set of weights 36 substantially centered on theother first frame section 32 defines the location of that portion of thesecond support member 26. Although shown as a stepped set of fourweights in FIG. 2, the number and size of weights 36 used is selectableas a function of the size of the system 10 and the conditionsexperienced in the body of water 18. Perimeter base weights 40preferably positioned on perimeter posts 42 provide additional weight tothe respective support members 24,26 as desired and required. Protectivepost safety caps 44 may be used to reduce the impact of any contact withupper surfaces of the posts 42. The safety caps 44 may be made ofrubberized or other suitable material and may be colored with some typeof warning color.

As illustrated in FIG. 3, one embodiment of the weights 36 or 40 arepreferably formed with a hollow casement body 37 having a fill port 39for receiving a weight-providing material 41 that may be somethingsubstantially permanent, such as concrete. A casement cap 43 isthreadingly engaged to the threaded fill port 39 to enclose the material41 therein. Alternatively, the cap 43 may be removed to allow water tofill the casement body 37. The casement body 37 may be made of anysuitable material, including plastic. As another alternative, theweights 36 or 40 could comprise a complementary pair of hollow, halfdonut shaped bodies filled with a weight-providing material and thensnapped or otherwise joined together.

With continuing reference to FIGS. 1 and 2, each of frame assembly 30further includes an intermediate frame section 46 detachably connectedto the first frame section 32. The intermediate section 46 acts as theprimary structural member for retaining the impact curtain 12 to bedescribed herein. It is preferably threadingly engaged at a bottom endthereof to the top end of the first frame section 32. The intermediateframe section 46 may be of any selectable length dependent upon thedepth of the body of water 18 where it is positioned on the floor 16. Itmay be formed of a material similar to that used for the first framesection 32. The first frame section 32 and the intermediate framesection 46 jointly define a bottom frame section. Alternatively, thefirst and intermediate frame sections could comprise a single, integralmember defining the bottom frame section.

Each support member 24,26 may also include one or more supplemental baseplates 38 disposed on the floor 16 of the body of water 18, at alocation remote from the primary base plate 28. The supplemental baseplates 38 are preferably anchored to the floor 16 by one or more weightsin the same manner as the primary base plates 28. A wire, cable or rod45 extends from each supplemental base plate 38 to the correspondingfirst or intermediate frame section 32,46 to further secure the supportmember 24,26.

The remaining portion of each of the respective support members 24,26 isa top frame section 48, preferably formed of the same material used tomake sections 32 and 46. The top frame section 48 is preferably cappedwith a protective safety cap 50 much like the post safety cap 44. Auseful aspect of the present invention is the coupling of the top framesection 48 to the intermediate frame section 46. In order to ensure thatthe system 10 performs its desired function when waves 20 exist whilekeeping the curtain 12 substantially out of sight when the water 18 iscalm, the top frame section 48 is hinged to the intermediate framesection 46. As best seen in FIG. 4, this configuration permits pivotingof the top frame section 48 so that that portion of the two members24,26 lays over the water 18 during calm conditions (shown in solidlines in FIG. 4) and freely rises when forced by wave or wake action(shown in dashed lines in FIG. 4).

Referring to FIG. 5, an upper region 52 of each of the intermediateframe sections 46 is formed with an angled recess 54 and includes apaired eyelet flange 56. Relatedly, a lower region 58 of top framesection 48 includes a mirror image angled recess 60 that matches in anopposing manner the angled recess 54 of region 52. The lower region 58also includes a ported hinge flange 64 designed to fit within the spacebetween the paired eyelets of flange 56 in a pivoting manner. Aremovable hinge pin 66 may keep the two frame sections 46,48 detachablyconnected together. Moreover, the hinge pin 66 allows the top framesection 48 to pivotally move with respect to the intermediate framesection 46, which remains in a fixed position due to its coupling to thefirst frame section 32. It can be seen in FIG. 5 that the angledrecesses 54 and 60 of the respective frame sections do not extendcompletely. Instead, they are truncated such that upper region 52includes a truncation face 68 upon which lower region 58 bottoms outwhen the top frame section 48 is in its most upright position. Thisconfiguration prevents the curtain 12 from falling back towards theshore under the load of the waves 20 and become unable to provide waveattenuation capability. This function could alternatively beaccomplished with a chain, cable or the like connected between the twoframe sections 46, 48. While a variety of angles of the angled recesses54,60, may be contemplated, it has been observed that an angle of about20° is suitable.

As seen in FIG. 4, the top frame section 48 does not become completelyvertical in its most upright position with this hinge configuration.This arrangement facilitates returning the curtain 12 to the lowerposition after the wave 20 passes. Although it is anticipated that theweight of the curtain 12 may be sufficient to ensure that when the frameconnecting configuration of FIG. 5 is employed the curtain 12 will layover during calm water conditions, the top frame 48 may be modified toaccomplish that. Specifically as shown in FIG. 6, when a hollow materialis employed to form the top frame section 48, a frame return weight 70may be deployed therein, preferably above the frame section's center ofmass. A tension bolt 72 may be threadingly employed within a frame port74 to maintain the return weight 70 in position within the frame section48.

Returning to FIGS. 1 and 2, the attenuation or impact curtain 12includes a primary impact zone 76, a first frame attachment section 78and a second frame attachment section 80. The attachment frame sections78,80 are preferably looped regions extending the entire height of thecurtain 12 and are configured to be placed around the frame sections48,46. When so deployed, the support members 24,26 position the curtain12 at its opposing ends in a substantially vertical orientation.

The curtain 12 may be fabricated of a substantially non-metallicmaterial having energy absorbing qualities, such as neoprene. The loopedsections may be made by permanently threading the curtain material ontoitself or employing some type of releasable attachment mechanism, suchas a hook-and-loop attachment. When the frame return hinge arrangementof FIG. 5 is employed, the curtain 12 preferably includes frame ports 82to allow the top frame section 48 to move with minimal stretching of thecurtain 12.

The curtain 12 may also include one or more flotation devices 84deployed along its upper surface to keep the curtain open as shown withminimal sagging. The flotation devices 84 may be foam materials coupledalong the upper edge of the curtain 12 by rope or string 86 throughgrommeted eyelets 88 incorporated into the curtain 12. Alternatively,the flotation devices 84 could be retained inside of sleeves formedalong the upper edge of the curtain 12. The curtain 12 may further befixed in position using underwater curtain weights 90 periodicallyspaced on the floor 16. As with the flotation devices 84, the curtainweights 90 may be coupled to the lower edge of the curtain 12 by weightrope or string 92 connected to curtain weight grommeted eyelets 94. Itis to be noted that the curtain 12 may include periodic perforationstherein to allow a portion of the water 18 and waves 20 to passtherethrough.

Turning now to FIGS. 7 and 8, a second embodiment of a portablebreakwater system 110 is shown. Like the first embodiment, thebreakwater system 110 includes an attenuation or wave-impact curtain 112supported between a first support member 124 and a second support member126 disposed on the floor 116 of a body of water 118. The first supportmember 124 and the second support member 126 both include a primary baseplate 128 and a frame assembly 130 extending upwardly from the baseplate 128. The frame base plates 128 preferably include one or moresecuring cleats 131 to stabilize the base plate 128 on the underlyingfloor 116, particularly when that surface is rough or uneven in someway. The base plates 128 may be fabricated of any suitable material ofsufficient density and capable of surviving underwater conditions.Further, the base plate 128 may be formed with perforations in a surfacethereof in order to allow underwater currents to pass therethrough withminimal interference.

Each frame assembly 130 includes a bottom frame section 132 extendingupwardly from the base plate 128. The bottom frame section 132 may befabricated of a non-metallic material or a metallic material and may behollow or solid. It is designed to be detachably affixed to the baseplate 128.

Each support member 124,126 further includes one or more weights 136stacked thereon for the purpose of maintaining the respective baseplates 128 in place and ensuring that the entire system 110 remains inplace where positioned on the floor 116 during the variety ofenvironmental conditions to be experienced. The weights 136 arepreferably of a donut shape so that they may be fixed in position aboutthe bottom frame section 132. A locking or hitch pin 134 is insertedthrough the first frame section 132 just above the uppermost weight 136to prevent relative movement between the bottom frame section 132 andthe stack of weights 136. The weights 136 may be formed in alternativeshapes provided they serve the function of anchoring the system and itscomponents in place where desired.

Perimeter base weights 140 are preferably positioned on perimeter posts142 to provide additional weight to the respective support members124,126 as desired and required. Protective post safety caps 144 may beused to reduce the impact of any contact with upper surfaces of theposts 142. The safety caps 144 may be made of rubberized or othersuitable material and may be colored with some type of warning color.The weights 136,140 are similar to those in the first embodiment.Although not shown in FIG. 7, supplemental base plates like thosedescribed above can also be employed.

Each frame assembly 130 further includes a top frame section 146disposed over the bottom frame section 132 in a telescoping manner. Thatis, the top frame section 146 is a hollow member that slideslongitudinally over the bottom frame section 132. Referring to FIG. 9,the top frame section 146 has an internal lip 147 formed on its lowerend, and the bottom frame section 132 has an external lip 133 formed onits upper end. The two lips 133,147 cooperate to prevent the top framesection 146 from sliding off the bottom frame section 132. The top framesection 146 is preferably capped with a protective safety cap 150 muchlike the post safety caps 144.

The attenuation or impact curtain 112 includes a primary impact zone176, a first attachment section 178 and a second attachment section 180.The attachment sections 178,180 are preferably looped regions extendingthe entire height of the curtain 112 and are configured to be placedaround the top frame sections 146 of the respective support members124,126. The support members 124,126 thus position the curtain 112 atits opposing ends in a substantially vertical orientation. The curtain112 is attached entirely to the top frame sections 146 so as to rise andfall with the top frame sections 146 relative to the bottom framesections 132.

The curtain 112 may be fabricated of a substantially non-metallicmaterial having energy absorbing qualities, such as neoprene. Theattachment sections 178,180 may be made by permanently threading thecurtain material onto itself or employing some type of releasableattachment mechanism, such as a hook-and-loop attachment. The curtain112 may also include one or more flotation devices 184. The flotationdevices 184 may be foam materials coupled along the upper edge of thecurtain 112 by rope or string 186 through grommeted eyelets 188incorporated into the curtain 112. Alternatively, the flotation devices184 could be retained inside of sleeves formed along the upper edge ofthe curtain 112. It is to be noted that the curtain 112 may includeperiodic perforations therein to allow a portion of the water 118 andwaves 120 to pass therethrough.

In operation, the flotation devices 184 hold the upper edge of thecurtain 112 at the level of the water 118 with minimal sagging. Duringcalm conditions, this means that the top frame sections 146 and curtain112 are relatively low with respect to the bottom frame sections 132 (asdepicted in solid lines in FIG. 8). When a wave 120 approaches, theflotation devices 184 rise with the wave pulling the curtain 112 upwardas well. The telescoping top frame sections 146 slide upwardly withrespect to the bottom frame sections 132, allowing the curtain 112 tofreely rise so as to be in position to attenuate the wave 120 (asdepicted in dashed lines in FIG. 8). Because the entire curtain 112rises and falls with the top frame sections 146, the curtain weights 90that are employed in the first embodiment are not used in the secondembodiment.

Referring to FIG. 10, a third embodiment of a portable breakwater system210 is shown. The breakwater system 210 of this embodiment includes atleast one attenuation or wave-impact curtain 212 that is supported onpre-existing underwater structure located in a body of water 218. In theexample illustrated in FIG. 10, the pre-existing underwater structure isa dock 208. Preferably, the dock 208 can be an L-shaped structure thatincludes a first section (not shown) that extends outward from the shoreof the body of water 218, and a second section 209 that extendsperpendicularly from the distal end of the first section. As such, thesecond section 209 is oriented substantially parallel to the shore. Itshould be noted that the curtain 212 is not limited to use with L-shapeddock structures, but can be used with a wide variety of underwaterstructures.

The dock 208 includes a plurality of underwater support members, such aspoles or posts, that extend upward from the floor 216 of the body ofwater 218 to support the above-water portion of the dock 208. First andsecond ones 224, 226 of such support members are shown in FIG. 10 forsupporting the second dock section 209. The first and second supportmembers 224, 226 may be made of any material suitable for prolongedexposure to water.

In one possible configuration of this third embodiment, an attenuationcurtain 212 is supported between the first and second support members224, 226. This is accomplished using a first attachment sleeve 278attached to a first end of the curtain 212 and a second attachmentsleeve 280 attached to the opposite end of the curtain 212. The firstattachment sleeve 278 is slidingly mounted on the first support member224 below the above-water portion of the dock 208, and the secondattachment sleeve 280 is slidingly mounted on the second support member226 below the above-water portion of the dock 208. With thisarrangement, the curtain 212 freely rises and falls in response to waveor wake action.

As shown in FIGS. 11 and 12, the first attachment sleeve 278 includes apair of brackets 295 arranged on opposite sides of the first supportmember 224 and the curtain 212. Specifically, each bracket 295 has acentral indented section 296 and first and second planar flanges 297,298 formed on respective sides thereof. The brackets 295 are arranged sothat the two indented sections 296 enclose the first support member 224,with the curtain 212 being sandwiched between the two first flanges 297.The corresponding first flanges 297 are connected by any suitablefasteners such as nuts-and-bolts 299, and the corresponding secondflanges 298 are similarly connected by suitable fasteners 299. Thus, thetwo brackets 295 are connected together so as to attach the sleeve 278to the curtain 212 and allow the sleeve 278 and curtain 212 to sliderelative to the first support member 224. It should be understood thatthe indented sections 296 are not limited to the semi-circularconfiguration shown in FIGS. 11 and 12 and can have other recessedconfigurations including non-circular curvatures, rectangular recesses,and the like. The second attachment sleeve 280 is substantially the sameas the first and is therefore not described in detail here.

The curtain 212 may also include one or more flotation devices 284. Theflotation devices 284 may be foam materials coupled along the upper edgeof the curtain 212 by rope or string 286 attached to the attachmentsleeves 278, 280. Alternatively, the rope or string 286 can be attachedto the curtain 212 via grommeted eyelets incorporated therein. Asanother alternative, the flotation devices 284 could be retained insideof sleeves formed along the upper edge of the curtain 212. It is to benoted that the curtain 212 may include periodic perforations therein toallow a portion of the water 218 and waves to pass therethrough.

In operation, the flotation devices 284 hold the upper edge of thecurtain 212 at the level of the water 218 with minimal sagging. Duringcalm conditions, this means that the attachment sleeves 278, 280 andcurtain 212 are relatively low with respect to the first and secondsupport members 224, 226. When a wave approaches, the flotation devices284 rise with the wave pulling the curtain 212 upward as well. Theattachment sleeves 278, 280 slide upwardly on the respective supportmembers 224, 226, allowing the curtain 212 to freely rise so as to be inposition to attenuate the wave. Because the entire curtain 212 rises andfalls with the attachment sleeves 278, 280, the curtain weights 90 thatare employed in the first embodiment are not used in the thirdembodiment.

Referring again to FIG. 10, it is noted that additional curtains 212 canbe attached to the dock 208 between adjacent pairs of support members.In this case, a single attachment sleeve could be used to attachadjacent ends of two curtains to the same support member. As with theprior embodiments, each curtain 212 may be fabricated of a substantiallynonmetallic material having energy absorbing qualities, such asneoprene.

While specific embodiments of the present invention have been described,it will be apparent to those skilled in the art that variousmodifications thereto can be made without departing from the spirit andscope of the invention as defined in the appended claims.

1. A breakwater system for use in a body of water having a floor, saidbreakwater system comprising: first and second support membersconstructed of generally rigid elements adapted to be positioned on saidfloor of said body of water, said first and second support members bothincluding a bottom frame section and a top frame section mounted on saidbottom frame section to slide longitudinally thereon; and a curtainattached between said first and second support members, said curtainbeing disposed at least partially within the vertical extent of saidsupport members, wherein said first and second support members allowsaid curtain to freely rise in response to a wave in said body of waterand freely fall after a wave passes by means of said slidable framesections.
 2. The breakwater system of claim 1 wherein a portion of saidcurtain is attached to each bottom frame section and another portion isattached to each top frame section.
 3. The breakwater system of claim 1wherein said curtain is attached entirely to each top frame section. 4.The breakwater system of claim 1 wherein said first and second supportmembers both include a base plate and a frame assembly extendingupwardly from said base plate.
 5. The breakwater system of claim 4wherein said first and second support members both further include oneor more weights mounted on said base plate.
 6. The breakwater system ofclaim 5 wherein said one or more weights are disposed about said bottomframe section.
 7. The breakwater system of claim 5 wherein said firstand second support members both further include one or more additionalweights mounted on said base plate.
 8. The breakwater system of claim 4wherein said first and second support members both further include asupplemental base plate located remote from said first-mentioned baseplate and a connector element extending between said supplemental baseplate and said frame assembly.
 9. The breakwater system of claim 1wherein said curtain is fabricated from a material having energyabsorbing qualities.
 10. The breakwater system of claim 1 furthercomprising at least one flotation device attached to said curtain. 11.The breakwater system of claim 10 wherein said flotation device isattached along an upper edge of said curtain.